ML Engineer (RecSys)

Lisbon, Portugal

We are looking for a Senior ML developer to join our Recommendation system team: working on building a personalized product feed for each user. The role involves not only data analysis, hypothesis creation, modeling, and experimentation, but also writing production code capable of handling high loads.

Tech stack: Java, Kotlin, Python, Scala, Spark, catboost, MongoDB, Cassandra, Kafka

Responsibilities

• Strong algorithmic skills: knowledge of fundamental algorithms and data structures, as well as their implementation in standard libraries

• Proficiency in any language: experience in developing and debugging distributed, high-load applications, and writing testable code

• Industry experience in Machine Learning: familiarity with key modeling and training approaches (linear models, GBDT, DNN, etc.), knowledge of statistics, and end-to-end ML development experience, including raw data analysis, hypothesis formulation, model creation, experimentation, and deploying results into production

Preferred

• Experience in developing recommendation or search systems

• Experience training neural network models

• Experience working with various data sources: Spark, Cassandra, Mongo, Kafka

• Knowledge of Go

We offer

• Compensation package: base salary and performance-based bonuses

• Office-first: flexible hours with a possibility to work remotely 52 days per year

• Care & Wellbeing: health insurance (including dental care) for employees and their children, daily meal allowance, and 100% paid sick leave

• Relocation Support: full assistance for a smooth relocation for the employees and their family

• Team & Growth: collaboration with colleagues across Portugal, Brazil, Latvia and China, with opportunities for promotions, professional trainings, and English & Portuguese courses

• Community & Engagement: annual team building activities, knowledge-sharing workshops, and a strong sense of team work